X-ray imaging apparatus

ABSTRACT

An X-ray imaging apparatus includes a body unit including a bed unit where an object is put, an X-ray irradiation unit configured to irradiate an X-ray to the object and an X-ray detector configured to detect the X-ray passing through the object, an input unit configured to input control information to control at least part of operation of the body unit, a selection unit configured to select ON or OFF of a lock mode and a controller configured to determine at least part of the control information is locked when the lock mode is ON and the at least part of the control information is released when the lock mode is OFF.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. P2004-213275 filed on Jul. 21, 2004, the entire contents of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to an X-ray imaging apparatus.

BACKGROUND

In an tableside controlled X-ray imaging apparatus, an operation panel that is operated by a doctor or a radiological technologist is located near an bed part, for example. Although the operation panel is located at a position so as to be easily operated, such a location is a position where a patient can also touch easily. An tableside controlled X-ray imaging apparatus is disclosed in Japanese Patent Publication (Kokai) No. 7-327984.

Switches to instruct execution of fluoroscopy or radiography, for example, are arranged on the operation panel. When the patient who is laid on a table top touches the switches, X-ray irradiation may be performed.

For this reason, using a conventional X-ray imaging apparatus, while the patient is laid on the table top, the doctor or the radiological technologist is not allowed to leave the X-ray imaging apparatus. However, it is a personal agreement and may not perfectly protected.

As described above, it is difficult to prevent that the patient touches the operation panel with the conventional tableside controlled X-ray imaging apparatus, and unnecessary X-ray irradiation may be performed, for example.

In addition, if the operation panel is located at a position where the patient cannot touch easily, it is difficult also for the doctor or the radiological technologist to operate.

SUMMARY

One object of the present invention is to ameliorate at least one of the above-mentioned problems, and there is provided an X-ray imaging apparatus which can reduce operation mistake without deterioration in operationality. According to one aspect of the present invention, there is provided an X-ray imaging apparatus comprises a body unit including a bed unit where an object is put, an X-ray irradiation unit configured to irradiate an X-ray to the object and an X-ray detector configured to detect the X-ray passing through the object, an input unit configured to input control information to control at least part of operation of the body unit, a selection unit configured to select ON or OFF of a lock mode and a controller configured to determine at least part of the control information is locked when the lock mode is ON and the at least part of the control information is released when the lock mode is OFF.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1A is a front view of an X-ray imaging apparatus in a first embodiment;

FIG. 1B is a top view of the X-ray imaging apparatus in the first embodiment;

FIG. 1C is a side view of the X-ray imaging apparatus in the first embodiment;

FIG. 2 is a perspective view of a spot side operation part of the X-ray imaging apparatus shown in FIGS. 1A through 1C;

FIG. 3 is a block diagram of the X-ray imaging apparatus shown in FIGS. 1A through 1C;

FIG. 4 is a flow chart to receive an operation instruction from an user; and

FIG. 5 is an illustration displayed during a safe lock mode.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

Hereafter, a first embodiment is explained with reference to figures. FIGS. 1A through 1C are overviews of an X-ray imaging apparatus in the first embodiment. FIG. 1A is a front view, FIG. 1B is a top view and FIG. 1C is a side view of the X-ray imaging apparatus.

As shown in FIGS. 1A through 1C, the X-ray imaging apparatus in the first embodiment includes a bed part 1, a base part 2, a spot carriage part 3, an image intensifier spot part 4 (hereinafter called I.I. spot part), a spot side operation part 5, and a table side operation part 6.

The bed part 1 includes a table top 1 a on an upper part. A patient is laid on the table top 1 a. In the bed part 1, a table top moving mechanism part 11 shown in FIG. 3 to move the table top 1 a is located. Moreover, in the bed part 1, an X-ray tube 7 which irradiates an X-ray to the patient on the table top 1 a and a beam limiting device 8 which adjusts an X-ray irradiation range are located.

The base part 2 that is fixed to a floor in an operating room where the X-ray imaging apparatus is located supports the bed part 1. The base part 2 includes a tilting mechanism part 10 which tilts the table top 1 a in a direction as indicated by arrow A.

The spot carriage part 3 is attached to the bed part 1. The spot carriage part 3 supports the I.I. spot part 4 to be moved in a horizontal direction and a perpendicular direction to the bed part 1. The spot carriage part 3 includes a power assistant mechanism part which performs power assistance of movement of the I.I. spot part 4.

The I. I. spot part 4 changes an X-ray irradiated through the patient into an electric signal to make an X-ray image.

The spot side operation part 5 and the table side operation part 6 receive instruction from the doctor or the radiological technologist. The spot side operation part 5 is located at the end of the I.I. spot part 4, and is mainly used by the doctor, for example. The table side operation part 6 is located at the side of the bed part 1, and is mainly used by the radiological technologist, for example.

FIG. 2 is a expanded perspective view of the spot side operation part 5 shown in FIGS. 1A through 1C. As shown in FIG. 2, the spot side operation part 5 includes an operation button, a control lever and a display part. One of the operation buttons is a safe lock button 5 a. Under the safe lock button 5 a, a safe lock switch 5 d and a safe lock lamp 5 c shown in FIG. 3 are located. The safe lock button 5 a is pushed to turn on/off the safe lock switch 5 d and a light of the safe lock lamp 5 c.

Moreover, the spot side operation part 5 includes a handle 5 b. Inside the handle 5 b, power assistant sensors 5 h shown in FIG. 3 are arranged. The power assistant sensors 5 h including a plurality of sensors detect a direction and strength of power added by the handle 5 b

FIG. 3 is a block diagram of the X-ray imaging apparatus in the first embodiment. To simplify an explanation, further explanations are omitted by attaching the same reference numbers in FIG. 3 as illustrated in FIGS. 1A through 1C. As shown in FIG. 3, the I.I. spot part 4, the spot side operation part 5, the table side operation part 6, the beam limiting device 8, a high voltage source 9, the tilting mechanism part 10, the table top moving mechanism part 11, the power assistant mechanism part 12, and an alarm part 13 are electrically connected to a control part 14 directly or indirectly, respectively.

The spot side operation part 5 includes the safe lock lamp 5 c, the safe lock switch 5 d, a fluoroscopy/radiography switch 5 e and tilting switch 5 f, a table top move switch 5 g, the power assistant sensors 5 h, a format selection switch 5 i and a beam limiting operation switch 5 j, for example. The fluoroscopy/radiography switch 5 e and the tilting switch 5 f, the table top move switch 5 g, the format selection switch 5 i and the beam limiting operation switch 5 j are turned on by pushing corresponding bottoms located on the spot side operation part 5.

The table side operation part 6 includes a tilting switch 6 a, a table top move switch 6 b and an emergency stop switch 6 c, and the switches are turned on by pushing corresponding bottoms located on the table side operation part 6.

The high voltage source 9 generates high voltage so that the X-ray tube 7 irradiates the X-ray.

The alarm part 13 outputs alarm sound.

The control part 14 includes a computer and peripheral devices, such as a memory. The control part 14 controls the I.I. spot part 4, the beam limiting device 8, the high voltage source 9, the tilting mechanism part 10, the table top move mechanism part 11, the power assistant mechanism part 12 and the alarm part 13 according to the instruction inputted by the user operating the spot side operation part 5 and/or the table side operation part 6.

Next, operation of the X-ray imaging apparatus is explained. After the X-ray imaging apparatus starts, the control part 14 performs processing as shown in FIG. 4, in order to receive the instruction by the user.

In Step Sa1 in FIG. 4, the control part 14 initially sets a safe lock mode as OFF state. The safe lock mode is a mode which determines a lock state of the spot side operation part 5, and when the safe lock mode is ON, at least one operation of the spot side operation part 5 is locked, and when the safe lock mode is OFF, the lock of the operation is released.

In Step Sa2, the control part 14 holds to receive ON signal from the switches or the sensors of the spot side operation part 5 and the table side operation part 6. When one of the switches or the sensors turn on, the control part 14 goes forward to Step Sa3 from Step Sa2.

In Step Sa3, the control part 14 checks whether the switch turned on is the safe lock switch 5 d. When the turned on switch is the safe lock switch 5 d, the control part 14 goes forward to Step Sa4 from Step Sa3. In Step Sa4, the control part 14 further checks whether a period while the safe lock bottom 5 a corresponding to the safe lock switch 5 d is pushed is more than 2 seconds.

When the bottom of the safe lock switch 5 d is pushed for a period not more than 2 seconds, the control part 14 returns from Step Sa4 to Sep Sa2 to hold. That is, at this time, the control part 14 ignores the operation of the safe lock button 5 a. On the other hands, when the safe lock bottom 5 a is pushed for a period more than 2 seconds, namely when the safe lock bottom is pushed for a long time, the control part 14 goes forward to Step Sa5 from Step Sa4. In Step Sa5, the control part 14 changes ON/OFF of the safe lock mode. In Step Sa6, the control part 14 changes lighting of the safe lock lamp 5 c. That is, when the safe lock mode is OFF and the safe lock bottom 5 a is pushed for long time, the control part 14 changes the safe lock mode to ON and the turned off safe lock lamp 5 c to turn on. On the contrary, when the safe lock mode is OFF and the safe lock bottom 5 a is pushed for long time, the control part 14 changes the safe lock mode to OFF and the turned on safe lock lamp 5 c to turn off. After this, the control part 14 goes back to Step Sa2 to hold.

In Step Sa3, when the switch switched on is not the safe lock switch, the control part 14 goes forward to Step Sa7. In Step Sa7, Step Sa8 and Step Sa9, the control part 14 checks whether the switch switched on is one of the emergency stop switch 6 c, the format selection switch 5 i and the beam limiting operation switch 5 j. When the switch switched on is not any of these switches, and in other words, when the switched switch is one of the fluoroscopy/radiography switch 5 e, the tilting switch 5 f, the table top move switch 5 g, the power assistant sensors 5 h, the tilting switch 6 a and the table top move switch 6 b, for example, the control part 14 goes forward to Step Sa10 from Step Sa9. In Step Sa10, the control part 14 checks whether the safe lock mode is ON. When the safe lock mode is OFF, the control part 14 goes forward to Step Sa11 from Step Sa10. When the switch switched on is one of the emergency stop switch 6 c, the format selection switch 5 i and the beam limiting operation switch 5 j, the control part 14 goes forward to Step Sa11 from either Step Sa7, Step Sa8 and Step Sa9. That is, when any one of the emergency stop switch 6 c, the format selection switch 5 i and the beam limiting operation switch 5 j turns on, the control part 14 goes forward to Step Sa11 regardless of the state of the safe lock mode. Since the emergency stop switch 6 c is a switch which is used in an imperative situation, it is desired that the emergency stop switch 6 c can be used any time. The format selection switch 5 i is used for selecting a format among a plurality of formats, each of which corresponds to an X-ray irradiation range, such as a whole range or half range of X-ray detector. The format selection switch 5 i and the beam limiting operation switch 5 j are switches that are related to X-ray limiting. Since the operator operates the X-ray limiting frequently, the operation can be performed regardless of the safe lock mode. However, the format selection switch 5 i and the beam limiting operation switch 5 j may be locked when the safe lock mode is ON. When one of the fluoroscopy/radiography switch 5 e and the tilting switch 5 f, the table top move switch 5 g, the power assistant sensors 5 h, the tilting switch 6 a and the table top move switch 6 b turn on, the control part 14 goes forward to Step Sa11 only when the safe lock mode is OFF.

In Step Sa11, the control part 14 sends identification information of the switch switched on or the sensors to a main control processor. After that, the control part 14 goes back to Step Sa2.

The control part 14 performs the above-mentioned processing shown in FIG. 4 and further performs a main control processing as another task. In the main control processing, the control part 14 performs the following controls, respectively, according to the switch switched on. The control part 14 makes the I.I. spot part 4. active and starts to supply the high voltage to the X-ray tube 7 from the high voltage source 9, when the fluoroscopy/radiography switch 5 e turns on. When the tilting switches 5 f and 6 a turn on, the control part 14 controls the tilting mechanism part 10 to raise the bed part 1. The spot carriage part 3 and the I.I. spot part 4 are also raised according to the bed part 1 being raised. When the table top move switches 5 g and 6 b turn on, the control part 14 controls the table top move mechanism part 11 to move the table top 1 a. When one of power assistant sensors 5 h turns on, the control part 14 controls the power assistant mechanism part 12 to assist the movement of the I.I. spot part 4 in a direction determined by the sensors. The direction is a far or near direction to the patient and/or a longitudinal direction of the table top, etc. When the format selection switch 5 i turns on, the control part 14 chooses a format.

When the beam limiting operation switch 5 j turns on, the control part 14 controls the beam limiting device 8 to adjust the X-ray irradiation range. When the emergency stop switch 6 c turns on, the control part 14 performs emergency stop of operation of each part, such as the high voltage source 9, the tilting mechanism part 10, the table top move mechanism part 11 and the power assistant mechanism part 12.

When one of the fluoroscopy/radiography switch 5 e, the tilting switch 5 f, the table top move switch 5 g, the power assistant sensors 5 h, the tilting switch 6 a and the table top move switch 6 b turn on, while the safe lock mode is OFF, the above-mentioned operation is performed. However, when the safe lock mode is ON, the control part 14 goes forward to Step Sa12 from Step Sa10. The control part 14 controls the alarm part 13 to output the alarm sound in Step Sa12. In addition, without Step Sa11, the control part 14 goes back to Step Sa2. That is, while the safe lock mode is ON, when one of the fluoroscopy/radiography switch 5 e, the tilting switch 5 f, the table top move switch 5 g, the power assistant sensors 5 h, the tilting switch 6 a and the table top move switch 6 b turn on, the alarm sound outputs without performing each corresponding operation. Moreover, in addition to or instead of the alarm sound, the alarm part 13 may display a warning message shown in FIG. 5 on a display, for example.

Thus, according to the X-ray imaging apparatus in the first embodiment, when the user pushes the safe lock button 5 a for more than 2 seconds, the safe lock mode can be turned on and off. In addition, since the safe lock lamp 5 c turns on and off according to operation ON/OFF of the safe lock mode, the user can easily recognize the state of the safe lock mode.

And when the safe lock mode is ON, even if the fluoroscopy/radiography switch 5 e turns on, the X-ray irradiation from X-ray tube 7 is not performed. Therefore, when the safe lock mode is set to ON while the doctor or the radiological technologist leaves the X-ray imaging apparatus, even if the patient touches the spot side operation part 5 or the table side operation part 6, such as the fluoroscopy/radiography switch 5 e, unnecessary X-ray irradiation is not performed.

Moreover, in the first embodiment, when the safe lock mode is ON, even if the tilting switches 5 f and 6 a or the table top move switches 5 g and 6 b turn on, the tilting mechanism part 10 or the table top move mechanism part 11 does not operate. Therefore, when the safe lock mode is set to ON when the doctor or the radiological technologist leaves the X-ray imaging apparatus, even if the patient touches the spot side operation part 5 and the table side operation part 6, such as the tilting switches 5 f and 6 a or the table top move switches 5 g and 6 b, tilting of the bed part 1 or movement of table top 1 a is not performed.

Moreover, in the first embodiment, when the safe lock mode is ON, even if either of the power assistant sensors 5 h turns on, the power assistant mechanism part 12 does not operate. Therefore, when the safe lock mode is set to ON when the doctor or the radiological technologist leaves the X-ray imaging apparatus, even if the patient grasped the handle 5 b and the power assistant sensors 5 h turn on, power assistance of movement of the I.I. spot part 4 is not performed, and the I.I. spot part 4 does not move easily. As shown in FIG. 1, since the spot side operation part 5 is located on upper side of the patient laid on the table top 1 a, when the patient grasps handle 5 b by accident, the patient pulls the handle 5 b to the patient's side in many cases. In such a case, the power assistance works in such a direction that the I.I. spot 4 comes to the patient. For this reason, when the patient pulls the handle 5 b even a little, the I.I. spot 4 approaches the patient rapidly, which makes the patient surprised, however, it can reduce such a situation by the first embodiment. Especially, in a case when movement of the I.I. spot 4 in the far and near direction can be locked, the above-mentioned situation can be reduced and it is very useful.

Moreover, in the first embodiment, since the alarm sound is outputted when the safe lock mode is ON and one of the fluoroscopy/radiography switch 5 e, the tilting switch 5 f, the table top move switch 5 g, the power assistant sensors 5 h, the tilting switch 6 a and the table top move switch 6 b turn on as mentioned above, the doctor and the radiological technologist can notice a situation where the patient touches the spot side operation part 5 or the table side operation part 6. Thereby, the doctor and the radiological technologist can be reminded to observe the patient's action carefully.

The following various modification may be possible according to the first embodiment. For example, the operation for turning off the safe lock mode may not be limited to the long press of a button, but may be just to push a button again, or may be to push several bottoms simultaneously, etc. The X-ray imaging apparatus shown in FIGS. 1A through 1C may include a structure which can attach an X-ray tube on I.I. spot part 4 side and position a film under the table top 1 a to obtain an X-ray image on the film. In this situation, it is possible to control X-ray irradiation from the X-ray attached on I.I. spot part 4 side as well as the X-ray tube 7.

The present invention may be not limited to the above embodiments, and various modifications may be made without departing from the spirit or scope of the general inventive concept. Although the above embodiment and modification may include various steps or various elements, one or more steps or elements may be arbitrarily selected. For instance, one or more steps or elements described as the embodiment or modification may be omitted. In addition, some elements in different embodiments may be combined. According to the above embodiment, even if a first switch is touched by the patient, it can prevent irradiating the X-ray certainly. Since the first switch is arranged in such a position that the patient can touch, the operationality is not deteriorated. Moreover, in the first embodiment, although the I. I. spot part is shown as a detector which detects the X-ray passing through the patient and changes the X-ray into the electric signal, instead of the I. I., an indirect change type flat panel detector which changes the X-ray into an optical signal once to change the optical signal to an electric signal or a direct type flat panel detector which changes X-rays into a electric signal directly may be used. As another modification, the following feature may be applied. When the safe lock mode is ON, an operation of the spot side operation part 5 is locked, however an operation of the table side operation part 6 may not be locked. 

1. An X-ray imaging apparatus, comprising: a body unit including a bed unit where an object is put, an X-ray irradiation unit configured to irradiate an X-ray to the object and an X-ray detector configured to detect the X-ray passing through the object; an input unit configured to input control information related to control at least part of operation of the body unit; a selection unit configured to select ON or OFF of a lock mode, and a controller configured to determine at least part of the control information is locked when the lock mode is ON and the at least part of the control information is released when the lock mode is OFF.
 2. The X-ray imaging apparatus according to claim 1, wherein the input unit is located opposite to the bed unit such that the object is located between the input unit and the bed unit.
 3. The X-ray imaging apparatus according to claim 1, wherein the X-ray irradiation unit is located under the bed unit and the X-ray detector is located opposite to the X-ray irradiation unit such that the object is located between the X-ray irradiation unit and the X-ray detector.
 4. The X-ray imaging apparatus according to claim 3, wherein the input unit is attached to the X-ray detector.
 5. The X-ray imaging apparatus according to claim 4, further comprising a second input unit, attached to the bed unit, configured to input control information, and wherein the at least part of the control information inputted from the input unit attached to the X-ray detector is locked when the lock mode is ON and the control information inputted from the second input unit attached to bed unit is not locked even when the lock mode is ON.
 6. The X-ray imaging apparatus according to claim 1, wherein the controller locks the inputted information related to control of an X-ray irradiation when the lock mode is ON.
 7. The X-ray imaging apparatus according to claim 1, further comprising a tilting mechanism configured to tilt the bed unit, and wherein the controller locks the control information related to control of tilting of the bed unit when the lock mode is ON.
 8. The X-ray imaging apparatus according to claim 1, further comprising a table top move mechanism configured to move a table top of the bed unit, and wherein the controller locks the control information related to control of movement of the table top when the lock mode is ON.
 9. The X-ray imaging apparatus according to claim 1, further comprising a beam limiting unit configured to adjust an X-ray irradiation range irradiated from the X-ray irradiation unit, and wherein the controller locks the control information related to control of the beam limiting unit when the lock mode is ON.
 10. The X-ray imaging apparatus according to claim 1, further comprising a power assistant mechanism configured to assist movement of the input unit in a direction added by a handle of the input unit, and wherein the controller locks the control information related to control of the power assistant mechanism when the lock mode is ON.
 11. The X-ray imaging apparatus according to claim 10, wherein the power assistant mechanism assists movement in a far or near direction to the object, and the controller locks the control information related to movement of the input unit in the far or near direction when the lock mode is ON.
 12. The X-ray imaging apparatus according to claim 1, further comprising an alarm unit configured to give an alarm when the input unit is operated when the lock mode is ON.
 13. The X-ray imaging apparatus according to claim 12, wherein the alarm unit outputs alarm sound.
 14. The X-ray imaging apparatus according to claim 12, wherein the alarm unit displays a warning on a display unit.
 15. The X-ray imaging apparatus according to claim 1, further comprising an emergency stop unit configured to stop at least part of operation of the body unit, and wherein the controller unlocks the control information related to control of the emergency stop unit even when the lock mode is ON.
 16. The X-ray imaging apparatus according to claim 1, further comprising a beam limiting unit configured to adjust an X-ray irradiation range irradiated from the X-ray irradiation unit, and wherein the controller unlocks the control information related to control of the beam limiting unit even when the lock mode is ON.
 17. The X-ray imaging apparatus according to claim 1, further comprising a format selection unit configured to select a format, and wherein the controller unlocks the control information related to control of the format selection unit even when the lock mode is ON.
 18. The X-ray imaging apparatus according to claim 1, wherein the selection unit is a selection bottom that is a part of the input unit.
 19. The X-ray imaging apparatus according to claim 18, wherein the selection bottom includes; a selection switch configured to change ON or OFF of the lock mode; and a selection lamp indicating which ON or OFF of the lock mode is selected
 20. An X-ray imaging apparatus, comprising: a body unit including a bed unit where an object is put, an X-ray irradiation unit configured to irradiate an X-ray to the object and an X-ray detector configured to detect the X-ray passing through the object; means for inputting control information to control at least part of operation of the body unit and selecting ON or OFF of a lock mode, and means for determining at least part of the control information is locked when the lock mode is ON and the at least part of the control information is released when the lock mode is OFF. 